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TRENDS AND CYCLES IN LONG IRISH METEOROLOGICAL SERIES
 

Summary: TRENDS AND CYCLES IN LONG IRISH
METEOROLOGICAL SERIES
C.J. Butler, A. Garci´a-Sua´rez and E. Palle´
ABSTRACT
We have analysed the trends in four long meteorological time series from Armagh Observatory and
compared them with series available from other Irish sites. We find that although maximum and
minimum temperatures have risen in line with global averages, minima have risen faster than
maxima, thereby reducing the daily temperature range. The total number of hours of bright sunshine
has fallen since 1885 at the four sites studied, which is consistent with both a rise in cloudiness and
the fall in the daily temperature range. Over the past century, soil temperatures at both 30cm and
100cm depths have risen twice as fast as air temperature.
Wavelet analysis has found significant cycles with periods of 7Á8 years, 20Á23 years and 30Á33
years in the seasonal and annual meteorological series from Armagh. Some of these cycles are clearly
linked to the North Atlantic Oscillation.
INTRODUCTION
In the ongoing discussion of climate change, there
is a need to identify trends and recurrent behaviour
in long meteorological series in order to develop a
more comprehensive understanding of the
processes involved. It is evident, from the outset,

  

Source: Armagh Observatory
Bago, Enric Palle - Instituto de Astrofísica de Canarias

 

Collections: Physics